Tracking who leads in active, mobilized piece deployment.
Why it matters
A tempo is one move. Counting who is ahead in development, and by how many, is the most useful evaluation in the opening — more useful than any judgement about squares.
It also decides behaviour. Two tempi ahead means look for a way to open the position; two behind means finish developing and refuse to be provoked.
See it on a board
White has both knights out and two pawns in the centre; Black has one knight and a queen that has moved twice. Nc3 was free, because the queen had to move anyway.
Checked: the position really has the feature described.
How to play it
- Count developed pieces for both sides — knights, bishops, castled king, rooks connected.
- Ahead: open lines and look for forcing moves before the opponent catches up.
- Behind: develop, castle, and avoid opening the position until you are level.
At each level
The same idea, said the way it is taught at each age.
Knight · ages 4–6
Count how many pieces each side has out. If you are ahead, open the game; if you are behind, catch up first.
Rook · ages 6–9
A move that develops and creates a threat is worth two. Look for those before looking for anything clever.
What goes wrong
- Opening the position while behind in development, which is how most quick losses happen.
- Counting pawn moves as development. Only pieces count.
Questions people ask
- How much is a tempo worth?
- Roughly a third of a pawn in the opening, and much more in an open position. Three tempi and open lines is worth a pawn, which is exactly the maths behind gambits.